Rheostat



(No Model.)

J. A. MOSHER.

RHEOSTAT.

No. 467,611; Patented Jan. 26, 1892.

Z? @7am/M5 ,7. eww? UNrrED l STATES PATENT i OFFICE'.

JOHN A. MOSHER, OF ABILENE, KANSAS.

RH EOSTAT.

SPECIFICATION forming part of Letters Patent No. 467,611, dated January 26, 1892.

Application tiled April 4, 1891. Serial No. 387,579. (No model.)

To @ZZ whom it may concern:

Be it known that I, JOI-IN A. MOSHER, a citizen of the United States, residing at Abilene, in the county of Dickinson, State of Kansas, have invented certain new and useful Improvements in Rheostats, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in rheostats; and it has for its objects, among others, to provide a simple, cheap, and efficient rheostat to be used in connection with any apparatus or under any circumstances where a good and reliable rheostat is required. I provide end castings having radial arms with grooves or channels, into which the insulating materialis inserted.

-I employ asbestus, placed around metallic strips, and around which I wind braided wire of any number of strands, the, braided wire being used by reason of its superior qualities of radiation over any wire having but a single strand. The castings are provided with bosses tapped to receive screws for the purpose of securing a jacket or case.

Other objects and advantages of the invention will hereinafter appear, and the novel features thereof will be speciiically defined by the appended claims.

The invention is clearly illustrated in the accompanying drawings, Which,lwitl1 the letters of reference marked thereon, form a part of this specification, and in which.

Figure l is a central longitudinal section through my improved rheostat, theY section being taken on the line z .a of Fig. 2. Fig. 2 is a plan thereof. Fig. 3 is a cross-section taken on the line y y of Fig. 1.v Fig. 4 is a detail, on an enlarged scale, of a portion of the braided wire.

Like letters of reference indicate like parts throughout the several Views.

Referring now to the details of the drawings by letter, A designates one of the heads and A the other. They are of like construction, each being formed with radial arms a, which are formed with channels extending 1 from the outer ends to the central boss or hub toward each other, as seen in Fig. 1. The

hubs are ribbed upon their interior, as shown at a2, to add strength thereto. The heads are formed upon their outer faces with bosses or projections b, screw-threaded to receive the screws B to form means for attachinga jacket or case.

C is a cylinder, the ends of which tightly embrace the hubs of the heads,as seen in Fig. l, and this cylinder may be held thereto by frictional contact of the parts or by other means-as, for instance, by screw c, as shown by dotted lines in Fig. l. This cylinderholds the heads the desired distance apart.

In wind-ing the asbestos and its coreI first take a strip of metal D and surround it either by wrapping with a braid or tape of asbestus, by a single piece enveloping the strip, or by two pieces, as shown at d in Fig. 3, and then place one of these strips thus prepared in each of the channels of the radial arms of the two heads, with the asbestus lying against the outer face of the cylinder, as seen in Figs. 1 and 3, and then take a wire 'E and Wrap it around all of the strips, beginning at one end and approach the other end in the form of a spiral. Another set of the asbestus-covered strips is then placed in the channels of the arms of the heads against the wrapped wire, as seen in Fig. 3, and these wrapped with the wire, as shown, and so on until the said channels are filled with the strips. The ends ot' the wire are suitably secured and the linewires F and G are connectedtherewith in any suitable manner. The wrapping may be done by hand or by any suitable machinery which may be devised for the purpose.

Modications in detail may be resorted to Without departing from the spirit of the invention or sacrilicing any of its advantages.

l. A rheostat 'composed of heads, a cylinder held thereon, and strips surrounded by asbestus held to said heads and wrapped with braided wire, substantially as specified.

2. A rheostat composed of heads having radial arms provided with channels, a cylinder held to the heads, strips covered with asbestus and held in the said channels, and a wrapping of braided wire, substantially as specified.

3. A rheostat composed of heads having radial arms formed with channels and hubs, a cylinder embracing and held to the hubs,

IOO

bosses screw-threaded, the cylinder einbracing` the hubs, the strips covered with asbestus and arranged in concentric serios in the said channels, and the wire wrapped around the several series, substantially as specified.

in testimony whereof I affix in y signature in presence of two witnesses.

JOHN A. MOSIIER. Witnesses:

JOHN M. FISHER, FRANK L. ooDRIci-i. 

